I'll grant that evolution can tell us something about the behaviour an animal species is likely to find acceptable.
However as you implicitly admit that behaviour will depend a lot more on the nature of the species in question.
More importantly, so far as we know, only humans have full-fledged moral codes and those are largely learned and the details are hugely influenced by culture.
Most important of all there is a big difference between using evolutionary principles to predict or explain elements of morality and actually using evolution to prescribe morality.